Early Apoptosis Detection Assay Kit

Transcription

1 Early Apoptosis Detection Assay Kit Item No Customer Service Technical Support E. Ellsworth Rd Ann Arbor, MI USA

2 TABLE OF CONTENTS GENERAL INFORMATION 3 Materials Supplied 3 Safety Data 4 Precautions 4 If You Have Problems 4 Storage and Stability 4 Materials Needed but Not Supplied INTRODUCTION 5 Background 6 About This Assay PRE-ASSAY PREPARATION 8 Reagent Preparation ASSAY PROTOCOL 9 Suspension Cells ANALYSIS 10 Performance Characteristics RESOURCES 12 Troubleshooting 13 References 14 Notes 15 Warranty and Limitation of Remedy Materials Supplied GENERAL INFORMATION Kit will arrive packaged as a 4 C kit. After opening kit, store individual components as stated below. Item Number Item Quantity/Size Storage Annexin V FITC Reagent 1 vial/100 tests 4 C Cell-Based Assay Annexin V Binding Buffer (10X) 1 vial/50 ml RT DAPI Viability Dye 1 vial/100 µl 4 C TMRE Dye 1 vial/50 nmol 4 C TO-PRO -3 Dye 1 vial/25 µl 4 C If any of the items listed above are damaged or missing, please contact our Customer Service department at (800) or (734) We cannot accept any returns without prior authorization.! WARNING: THIS PRODUCT IS FOR RESEARCH ONLY - NOT FOR HUMAN OR VETERINARY DIAGNOSTIC OR THERAPEUTIC USE. Safety Data This material should be considered hazardous until further information becomes available. Do not ingest, inhale, get in eyes, on skin, or on clothing. Wash thoroughly after handling. Before use, the user must review the complete Safety Data Sheet, which has been sent via to your institution. GENERAL INFORMATION 3

3 Precautions Please read these instructions carefully before beginning this assay. If You Have Problems Technical Service Contact Information Phone: (USA and Canada only) or Fax: Hours: M-F 8:00 AM to 5:30 PM EST In order for our staff to assist you quickly and efficiently, please be ready to supply the lot number of the kit (found on the outside of the box). Storage and Stability This kit will perform as specified if stored as directed in the Materials Supplied section, on page 3, and used before the expiration date indicated on the outside of the box. Materials Needed But Not Supplied 1. DMSO 2. PBS, ph Flow cytometer equipped with lasers and filters capable of exciting and detecting the wavelengths shown in Table A plate centrifuge Background INTRODUCTION Apoptosis is a programmed, non-inflammatory process of cell death in which a sequence of biochemical events leads to characteristic changes in cell morphology and eventually cell death. These changes include loss of cell membrane asymmetry and integrity, cell shrinkage, membrane blebbing, nuclear fragmentation, and chromatin condensation. During an organism s life cycle, apoptosis plays a vital role in normal development and maintenance of tissue homeostasis by eliminating old, unnecessary, and unhealthy cells. Dysregulation of apoptosis results in pathological conditions including neurodegenerative diseases, ischemic damage, autoimmune disorders, and cancer. 1 The ability to modulate cell fate (life or death) is thus recognized as an immense therapeutic potential in drug discovery. Research continues to focus on the elucidation and analysis of signaling pathways that control apoptosis. In order for apoptotic cell death to be a non-inflammatory process, cell debris must be removed without triggering an immune response. Thus, cells undergoing apoptosis release find me and eat me signals to induce their own phagocytosis. These signals include ATP and UTP, which are released through the selective channel pannexin 1 when it is activated. 2 This caspase-dependent event occurs early in apoptosis, and can be detected by staining with monomeric cyanine dyes such as TO-PRO Using this dye in combination with the traditional annexin V membrane lipid asymmetry probe, researchers can classify cells as early or late apoptotic and also distinguish apoptotic bodies from debris. A critical component of the apoptotic cascade is the loss of mitochondrial membrane potential (Δ Ψm ). Tetramethylrhodamine ethyl ester (TMRE) is a lipophilic rhodamine probe that is sequestered in intact mitochondria, and dissipated when Δ Ψm is lost during apoptosis. 4 This property makes TMRE useful for the flow cytometric detection of perturbations in Δ Ψm. 4 GENERAL INFORMATION INTRODUCTION 5

4 About This Assay Cayman s Early Apoptosis Detection Assay Kit employs FITC-conjugated annexin V as a probe for phosphatidylserine (PS) on the outer membrane of apoptotic cells, TMRE as a probe for Δ Ψm, DAPI as an indicator of membrane permeability/cell viability, and TO-PRO -3 to indicate the selective permeability of pannexin channels. The Early Apoptosis Detection Assay Kit allows phenotypic characterization of multiple different cell death parameters at the single-cell level. The reagents provided in the kit are sufficient to run 100 samples. Reagent Flow cytometric laser/filter sets (nm) What it stains DAPI 350 (or 405)/450 Nuclei of dead cells only (plasma membrane permeability) Annexin V FITC 488/525 PS flipped to outside of plasma membrane TMRE 488/585 Mitochondria with high membrane potential TO-PRO /700 Nuclei of dead cells and cells with active pannexin channels Table 1. Dye combination included in this kit and flow cytometer requirements 6 INTRODUCTION INTRODUCTION 7

5 PRE-ASSAY PREPARATION NOTE: This protocol is designed to be modular, as any of the fluorophores can be excluded if your experimental setup does not require them or cannot detect them. Reagent Preparation TMRE Solution Reconstitute TMRE Dye (Item No ) with 100 µl of DMSO. Mix well. After use, this TMRE Solution can be stored at -20 C and will be stable for up to six months. 1X Binding Buffer Dilute Cell-Based Assay Annexin V Binding Buffer (10X) (Item No ) 1:10 in distilled water. This solution will be stable for one year at room temperature. Staining Solution Prepare a Staining Solution by adding 2.5 μl of TMRE Solution, 2 µl of TO-PRO -3 Dye (Item No ), and 25 µl Annexin V FITC Reagent (Item No ) to 5 ml of 1X Binding Buffer prepared above. Mix well, protect from light, and use within one hour. DAPI Staining Solution Dilute DAPI Viability Dye (Item No ) 1:100-1:200 in PBS, ph 7.4. This solution will be stable for one hour at room temperature, protected from light. ASSAY PROTOCOL NOTE: It is recommended for flow cytometric applications to prepare single-stained control samples for the purposes of fluorescence compensation. Suspension Cells 1. Culture cells and treat as required by your experimental design in a CO 2 incubator at 37 C, testing each sample in duplicate or triplicate. For shorter duration experiments, the entire protocol can be modified to be performed in v-bottom polypropylene staining plates. 2. Collect 1-5 x 10 5 cells by centrifugation at 400 x g for five minutes and discard supernatant. 3. Resuspend the cells in 100 μl of Staining Solution prepared on page 8. Mix well to ensure separation of individual cells. 4. Incubate samples at room temperature in the dark for 15 minutes. 5. Centrifuge at 400 x g for five minutes. Carefully remove the supernatant. 6. Resuspend the cells in µl of DAPI Staining Solution. Mix well to ensure separation of individual cells. 7. Analyze the cells with a flow cytometer using the channels shown in Table 1 on page 7. The cells must be analyzed immediately. 8 PRE-ASSAY PREPARATION ASSAY PROTOCOL 9

6 Performance Characteristics DAPI TO-PRO -3 A C ANALYSIS non-necrotic Q1 Q4 Annexin V FITC Q2 Q TMRE Annexin V low Annexin V FITC Apoptosis induced by ultraviolet light in Jurkat cells, analyzed by flow cytometry. Side Sca er Forward Sca er 250K 200K 150K 100K 50K B 0 D 250K 200K 150K 100K 50K 0 Apoptotic cells Debris Apoptotic bodies Annexin V FITC Figure 1. Apoptosis induced by ultraviolet light in Jurkat cells, analyzed by flow cytometry. Jurkat cells were treated with 200 mj/cm 2 ultraviolet light (UV), then incubated for four hours at 37 C. Cells were then processed according to the suspension cell protocol in this kit booklet. Data were collected by a MACSQuant flow cytometer from Miltenyi and analyzed using FlowJo software. For analysis, live cells were gated as DAPI-negative (Panel A). The annexin V low cells (Panel B) were visualized within a TO-PRO -3 versus TMRE dot plot (Panel C), in which TMRE low, TO-PRO -3 high cells (Q1) are early apoptotic while viable cells are TMRE high, TO-PRO -3 low (Q3). The remaining events from Panel B can be separated into late apoptotic cells (annexin V positive, FSC high), apoptotic bodies (annexin V positive, FSC low) and debris (annexin V negative) (Panel D). % of total NT UV ETO anti-fas debris apoptotic bodies late apoptotic early apoptotic viable necrotic Figure 2. Segmentation of cell populations induced to undergo apoptosis by various stimuli. Jurkat cells were left untreated (NT) or stimulated with 200 mj/cm 2 ultraviolet light (UV), 50 µm etoposide (ETO), or 50 ng/ml anti-fas CH-11 for four hours prior to processing for flow cytometry as described in this kit booklet. The percentage of the total population in each segment was quantified as described in Figure ANALYSIS ANALYSIS 11

7 Troubleshooting RESOURCES Problem Possible Causes Recommended Solutions Strong staining for both annexin V FITC and DAPI in all samples, including controls No cells seen A. Cells are damaged during harvesting or processing for staining B. Cells are not healthy Cells lost during processing A. Process the sample gently B. Use only healthy cells Decrease treatment time or compound dosage References 1. Schiller, M., Bekerdjian-Ding, I., Heyder, P., et al. Autoantigens are translocated into small apoptotic bodies during early stages of apoptosis. Cell Death and Differ. 15, (2008). 2. F. B. Chekeni, M. R. Elliott, J. K. Sandilos, et al. Pannexin 1 channels mediate find-me signal release and membrane permeability during apoptosis. Nature 467(7317), (2010). 3. L. Jiang, R. Tixeira, S. Caruso, et al. Monitoring the progression of cell death and the disassembly of dying cells by flow cytometry. Nat. Protoc. 11(4), (2016). 4. T. Jurikova, O. Rop, J. Mlcek, et al. Phenolic profile of edible honeysuckle berries (genus Lonicera) and their biological effects. Molecules 17(1), (2011). No signal for annexin V FITC Very strong TMRE staining A. Not enough annexin V FITC in staining solution B. Cell death stimulus not potent enough TMRE concentration too high for your cells A. Titrate annexin V FITC for each cell type used B. Use stronger/positive control death stimulus Further dilute TMRE solution 12 RESOURCES RESOURCES 13

8 NOTES Warranty and Limitation of Remedy Buyer agrees to purchase the material subject to Cayman s Terms and Conditions. Complete Terms and Conditions including Warranty and Limitation of Liability information can be found on our website. This document is copyrighted. All rights are reserved. This document may not, in whole or part, be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form without prior consent, in writing, from Cayman Chemical Company. 03/13/2017, Cayman Chemical Company, Ann Arbor, MI, All rights reserved. Printed in U.S.A. 14 RESOURCES RESOURCES 15

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